By A Mystery Man Writer
Oda explained why there are big breasts in One Piece D: We realized that Robin has huge breasts. We checked from the side, and Nami also has huge breasts. Why do they both have such huge breasts? And could it be Oda-san's preference? That was a question from us two 10-year-olds. P.N. Sakucchan & Yuzu-chan
Oda explained why there are big breasts in One Piece - One Piece
Contrary to what the anime would have you believe, Oda has been fairly consistent with Nami's proportions since the early days of the series : r/ OnePiece
Choosing to Remain Strong Against Female Criticism: The vindictive storytelling of Oda Eiichiro - Anime Feminist
One Piece, Volume 66: The Road Toward the Sun by Eiichiro Oda
15 Things You Didn't Know About Nico Robin in One Piece
one piece - What's up with Nami's breast size? - Anime & Manga Stack Exchange
What One Piece's Female Characters Say About Beauty Standards
What One Piece's Female Characters Say About Beauty Standards
That's why :D - ONE PIECE Fanpage